Electrical Faults At Water-Cooled Motors - Siemens SIMOTICS M-1PH818 Operating And Installation Instructions

Table 8-1 Electrical faults
↓ Motor fails to start
↓ Motor accelerates sluggishly
↓ Humming noise when starting
↓ Humming noise in operation
↓ High temperature rise during no-load operation
↓ High temperature rise under load
X X X X
X
X X X X
X X X
X
X
X
X
8.10.3

Electrical faults at water-cooled motors

Note
When operating the machine with a converter, also refer to the operating instructions of the
frequency converter if electrical faults occur.
Table 8-2 Electrical faults
↓ Motor fails to start
↓ Motor accelerates sluggishly
↓ Humming noise when starting
↓ Humming noise in operation
↓ High temperature rise during no-load operation
↓ High temperature rise under load
X X X X
X
SIMOTICS M-1PH8 1PH818., 1PH822., 1PH828.
Operating Instructions 10/2017
↓ High temperature rise of individual winding sections
Possible causes of faults
Overload
Interruption of a phase in the
supply cable
Interruption of a phase in the
supply after switching on
X Winding short circuit or phase
short circuit in stator winding
Converter output voltage too
high, frequency too low
External fan is not running
Wrong direction of rotation of the
external fan
Reduced air intake
↓ High temperature rise of individual winding sections
Possible causes of faults
Overload
Interruption of a phase in the feeder
cable
Remedial measures
Reduce the load.
Check frequency converters and supply cables.
Check frequency converters and supply cables.
Determine the winding and insulation resistances. Con‐
tact the Service Center.
Check the settings at the frequency converter and per‐
form the automatic motor identification.
Check the external fan and its connections.
Check the electrical connections to the external fan.
Check the air ducts; clean the machine.
Remedial measures
Reduce the load.
Check the frequency converters and feeder cables.
Operation
8.10 Faults
101